Use PostFormValue instead of PostForm.Get

In `repo.RemoveDependency`, use `PostFormValue` instead of
`PostForm.Get`. The latter requires `ParseForm()` to be called prior,
and in this case, has no benefit over `PostFormValue` anyway (which
calls `ParseForm()` if necessary).

While this currently does not cause any issue as far as I can tell, it
feels like a bug lying in wait for the perfect opportunity. Lets squash
it before it can do harm.

Signed-off-by: Gergely Nagy <forgejo@gergo.csillger.hu>

routers/web/repo/issue_dependency.go

@@ -109,7 +109,7 @@ func RemoveDependency(ctx *context.Context) {
 	}
 
 	// Dependency Type
-	depTypeStr := ctx.Req.PostForm.Get("dependencyType")
+	depTypeStr := ctx.Req.PostFormValue("dependencyType")
 
 	var depType issues_model.DependencyType